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/// \file userPrimaryGenerator.cc
/// \brief Main program of the eventgenerator/userPrimaryGenerator example

#include "DetectorConstruction.hh"
#include "PhysicsList.hh"
#include "PrimaryGeneratorAction.hh"

#include "G4RunManager.hh"
#include "G4SteppingVerbose.hh"
#include "G4UIExecutive.hh"
#include "G4UImanager.hh"
#include "G4VisExecutive.hh"
#include "Randomize.hh"

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int main(int argc, char** argv)
{
  // detect interactive mode (if no arguments) and define UI session
  G4UIExecutive* ui = 0;
  if (argc == 1) ui = new G4UIExecutive(argc, argv);

  // choose the Random engine
  CLHEP::HepRandom::setTheEngine(new CLHEP::RanecuEngine);

  // use G4SteppingVerboseWithUnits
  G4int precision = 4;
  G4SteppingVerbose::UseBestUnit(precision);

  // construct the default run manager
  G4RunManager* runManager = new G4RunManager;

  // set mandatory initialization classes
  //
  runManager->SetUserInitialization(new DetectorConstruction);
  runManager->SetUserInitialization(new PhysicsList);

  runManager->SetUserAction(new PrimaryGeneratorAction);

  // initialize visualization
  G4VisManager* visManager = nullptr;

  // get the pointer to the User Interface manager
  G4UImanager* UImanager = G4UImanager::GetUIpointer();

  if (ui) {
    // interactive mode
    visManager = new G4VisExecutive;
    visManager->Initialize();
    UImanager->ApplyCommand("/control/execute vis.mac");
    ui->SessionStart();
    delete ui;
  }
  else {
    // batch mode
    G4String command = "/control/execute ";
    G4String fileName = argv[1];
    UImanager->ApplyCommand(command + fileName);
  }

  // job termination
  delete visManager;
  delete runManager;
}

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